超级电容器
电容
功率密度
材料科学
电极
电解质
电化学
化学工程
储能
纳米技术
电流密度
复合材料
功率(物理)
化学
物理化学
工程类
物理
量子力学
作者
Xueqin Lang,Haifeng Zhang,Xin Xue,Chuan-Lu Li,Xucong Sun,Zitang Liu,Haoshan Nan,Xiaoying Hu,Hongwei Tian
标识
DOI:10.1016/j.jpowsour.2018.09.040
摘要
To effectively enhance the energy density and cycling life of supercapacitors, we propose a novel strategy to use La0.85Sr0.15MnO3 as the core and encapsulated it with NiCo2O4 nanosheets to grow La0.85Sr0.15MnO3@NiCo2O4 ([email protected]) core–shell nanoflowers on Ni foam for the first time. Here, we systematically study the effect of KOH electrolyte concentration on the electrochemical behavior of [email protected] electrode. It manifests ultrahigh capacitance of 1341 F g−1 in 6 M KOH, which is around a threefold increase compared to that of 1 M KOH (400 F g−1 at 0.5 A g−1). Asymmetric supercapacitor assembled with activated carbon (AC) as negative electrode possesses remarkable performance with a wider work voltage of 1.8 V and maximum energy densities of 63.5 Wh kg−1 at a power density of 900 W kg−1. Even at ultra-high power density of 57600 W kg−1, it still retains high energy density of 25.2 Wh kg−1. Most importantly, it exhibits outstanding cycling life (retaining twice as much as the initial capacitance after 10,000 cycles), either as a single electrode or assembled asymmetric supercapacitor, much better than previously reported.
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